Major: large, dark reddish to blackish brown; eye small; humerus prominently raised in dorsal-oblique view as a large equilateral triangle; in side view, venter of head strongly convex and dorsum weakly so, with the head as a whole tapering conspicuously to the occiput; in full-face view, head subrectangular, with deep occipital cleft; posterior half of dorsal head surface smooth and shiny, anterior half carinulate, with no rugoreticulum; lower half of mesopleuron, humeri, and parts of mesonotum and propodeal dorsa carinulate, rest of mesosoma smooth and shiny; propodeal spines long and slender; postpetiole from above elliptical, with angulate margins.

Minor: yellow; occiput only slightly narrowed but with nuchal collar; apex of petiolar node strongly and broadly convex; spines short and directed backward; head and body mostly smooth and shiny.

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